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DescriptionMaps depict the close correlation of crop production, rainfall and temperature in the U.S. Midwest in the last half of the 20th century. In this map, the number of bushels of corn produced are shown in shades of green.

DescriptionThis map shows deviations in precipitation compared to the previous half-century. Areas of increased rainfall are shown in green (with the darkness increasing in proportion to the amount of increase) and areas

DescriptionChanges in average summertime temperatures are shown on this map, with higher than average temperatures in red, lower than average in blue. The analysis shows a very strong correlation between the areas with increased crop production, higher rainfall, and lower temperatures.